| 摘要 |
D-propoxyphene can be prepared by reacting d-oxyphene and propionic anhydride. Preferably, an excess of propionic anhydride is used. The reaction easily proceeds at temperatures of l0 to 80 .degree.C and produces yields exceeding 95 percent of theory. The free base d-propoxyphene can easily be converted in high yields to its hydrochloride or napsylate salts, both analgesics.
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